ASME B18.8.2:2020 pdf download

ASME B18.8.2:2020 pdf download.Taper Pins, Dowel Pins, Straight Pins, Grooved Pins, and Spring Pins (Inch Series)
2 GENERAL DATA FOR PINS
2.1 Types of Pins 2.1.1 TaperPins. Taperpins shall have a uniform taper overthepinlengthwithbothendscrowned.Mostsizesare supplied in both commercial and precision classes, the latter having generally tighter tolerances and being more closely controlled in manufacture. Dimensions for both classes are given in Table 3.1.1-1. 2.1.2 Dowel Pins. The following three varieties of dowel pins are covered. 2.1.2.1 Hardened Ground Machine Dowel Pins. This variety of hardened dowel pins shall have ground cylin- drical sides with one end pointed slightly to enter mating drive-fit holes and the other end rounded or crowned for drivingpurposes. Theyareavailableinstandardandover- size diameter series to satisfy initial and replacement re- quirements, respectively. Dimensions for both series are given in Table 4.1.1-1. 2.1.2.2 Hardened Ground Production Dowel Pins. This variety ofhardened dowel pin shall have ground cy- lindrical sides with both ends rounded sufficiently to enable the pin to be pressed into drive-fit holes. Dimen- sions are given in Table 5.1.1-1.
2.1.2.3 Unhardened Ground DowelPins. This variety ofdowel pin shall have ground cylindrical sides with both ends chamfered. Dimensions are given in Table 6.1.1-1. 2.1.3 Straight Pins. Straight pins shall have unground, straight cylindrical sides with both ends definitely cham- fered on chamfered straight pins and with both ends having broken corners or being slightly chamfered on square end straight pins. Dimensions are given in Table 7.1.1-1. 2.1.4 Grooved Pins. Groovedpins shallhaveunground, straight cylindrical sides with three or more swaged or extruded grooves equally spaced around the periphery to displace material beyond the basic pin diameter. Both ends ofthe pin are normally crowned or chamfered. Several types of grooved pins are available, including headed versions, grooved drive studs, and grooved T- head cotter pins, to satisfy various design considerations. Upon installation, the material displaced bythe grooves is forcedbackintothegroovesandreactsagainstthesides of the hole to promote retention of the pin or stud. Dimen- sions of the various types of groove pins are given in Tables 8.2.1-1 through 8.2.2-2, grooved drive studs are shown in Table 8.2.1-2, and grooved T-head cotter pins are covered in Tables 8.2.1-3 and 8.5.3-3. 2.1.5 Spring Pins. Springpins shall have straightcylin- drical sides with both ends chamfered. They are available in two basic types, reflecting slotted construction and coiled construction, and the latter in standard duty, heavy duty, and light duty series to suit various design requirements. Slotted-type spring pins having a single wall and coiled-type spring pins having multiple walls are formed or wrapped from strip stock to a diameter larger than basic and hardened in accordance with para. 9.6. Upon installation the pin diameters contract and the spring reaction against the sides of the hole tends to retain the pin. Dimensions of slotted-type spring pins and coiled-type spring pins are given in Tables 9.4.4-1 and 9.4.4-2, respectively
3 GENERAL DATA FOR TAPER PINS
3.1 Diameters 3.1.1 Major Diameter. The major diameter, A, of both commercial and precision classes of pins, specified in Table 3.1.1-1, is the diameter at the large end and is the basis for the pin size. 3.1.2 DiameteratSmallEnd. Thediameteratthesmall end of pins, B, is a function of the length and should be specified as a reference dimension fordeterminingdrilled hole size. (See Nonmandatory Appendix A.) It shall be computed by multiplying the nominal length of pin by the factor 0.02083 and subtracting the result from the basic pin diameter.3.2 Ends Both ends ofcommercial and precision class pins shall be crowned with a spherical radius as specified in Table 3.1.1-1. 3.3 Taper 3.3.1 Commercial Class. The taper on diameter of commercial class taper pins shall be 0.250 ± 0.006 in./ft (12.00 in.) of length. 3.3.2 Precision Class. The taper on diameter ofpreci- sionclasstaperpinsshallbe0.250 ± 0.004in./ft(12.00 in.) of length.